Flash folding device for knife folding units of folding machines



Nov. 3, 1931. R. P. MOGAARD FLASH FOLDING DEVICE FOR KNIFE FOLDING UNITS OF FOLDING MACHINES Filed April 7, 1951 gwwmtoz I DzYecZion hes? TraVeZs I Hie/Yarn Nqgaam Patented Nov. 3, 1931 UNITED srATEs. PATENr-QoFFI a 3101mm) PEDER MQGAARI), or MINNEAPOLIS, MINNESOTA, Assreiron-"ro rnn tinnnr roman company, or SIDNEY, onto, A CORPORATION 'or- 01110 J FLASH FOLDING DEvicE non nrrii romaine tours on romaine mnoniivns The invention relates to a flash folding device for knife folding units of foldingma chines.

The object of the present invention'is to provide for knife folding units of folding machines asimple, practical and eflicient flash folding means adapted to fold or tuck in the flash portion of a circular or folder simultaneouslyfwith the folding of the sheet by theknife folding unit to fold a sheet into a circular or folder. v

A further object of the invention is to provide flash folding means of this character adapted to support the-flash portion of a sheet While the knife of" the knifeffolding unit starts a longitudinal fold beyond the flash folding means and t0 enablethe flash I folding meansto fold of tuckin the flash portion of the sheet without tearing or otherwise injuring the sheet'or interfering with the speed of the folding machine. 1 v With these and other objects in view, the invention consists in the construction'and novel combination and arrangement'of parts hereinafter fully described, illustrated in the accompanying drawings, and set forth in the claims hereto appended, it being understood that various changes in the form, pro; portion and minor details of construction, within the scope of the claims, may be resorted to without departing from the spirit of the invention or sacrificingi any of thewadvantages thereof; i

Inthedrawingsz- A p A Figure 1 is a plan view of a portion of the folding machine showing a knife folding unit provided with aflash foldingplate con structed in accordance with this invention a. sheet havinga flash portion being illustrated in'dot and dash'lines. v l

Fig. 2 is a central longitudinal view ofthesame. p a I Fig. 3 is awperspective view of a portion of the sheet showing the flash portion and illustrating the lines of scoring-to facilitate sectional 1931. Serial No. 528,436.

the folding tion thereof. Fiqr i is a'similar view showing the sheet and dash portion partially folded. i f

- Fig. 5 is a detail perspec'tive view of a portion of the sheet showing the same and the flash portion nearly completely folded, the parts being slightly opened to facilitate illustration thereof.

In the accompanying drawings, in which is illustratedthe preferred embodiment of the invention, 1 designates a pointed tapered. forming platehaving an outer substantially rectangular attaching portion 2'which is: se-

cured by screws 3 or other suitable 'fastening devices, to a stationary portion 4 of the frame of 'a' folding machine having a. knife folding unit. The knife folding unit comof the sheet and the -flash-pork I prises a pair of knurled rollers5 and a knife forthis purpose, detailed illustration thereof is deemed unnecessary: Theisheettravels in the direction of the arrow indicated in Fig; '1 of the drawings as denoted by the legend Direction sheet travels on Fig; 1,

and suitable stops 8 are provided for limiting the travel of the sheet to position the same properly with relation to the knife folding unit and the flash fold device.

The knife 6 is provided with a corrugated sheet engaging edge 9 and the end 10 adjacent the flash fold device is angled oil to clear and avoid. interference with .the flash portion of the'sheet as the fold is formed.

In order to facilitate folding, the angular flash folds and the longitudinal straight fold are all scored at the time the flash portion of the sheet is die cut, as indicated by the dot and dash lines 11, 12 and 13, as clearly indicated in Fig. 3 of the drawings.

The flash portion 7 of the sheet is tapered inwardly as indicated by the dot and dash lines 12 which define the side edges of the flash portion and the outer edge 7* which is shown curved-for ,convenience,i'=may .be-of any configuration, as wilt-be readily understood.

The pointed tapering forming ,plate 1 which'folds and tricks in the flash portion of the sheet 'simultaneouslv'with the formation of the, longitudinalfold-thereof, is proa vided at the juncture of the attaehing portion and the tapered foldinggportion with an offset or bend 14: extending upwardly from the -attachin2 portion and-the taperedfflash foldingportion 15 is set at an angle or incli-nation tothe horizontal sothatwhen the flash portion'of the: sheet -restsupon" and is supported by the tapered flash folding :portion 2115,- the point 16 of the :tapered portion 15 is spaced from the lower face ofthe flash portionl-ofthe sheet :so that when? the knife strikes the sheet-the tip oruapexiof thetaperedsportion of the plate clears the vflash on the underside about oner-eighthftothreethirtyseconds of an inch. This spaceordistance 'will enable :-the iflash iportio n-a of the sheet to be successfullv folded -withont' tearing or otherw se injuring the sheet and with out materially interfering with the-speed I, of operation of the-folding machine.

face: of the? flash portion ofsthewsheet, ftElillluS- trated :in Hi '2 sheets provided #witli; flash portions may be rapidly "folded. v.aA'pointed' forming 5 plate I supports :the flash" pnrtion sof the sheet "while the knife starts :the Ilongitudinal 'tfold, at a point beyond: the fiash. but

as the :knife continues downward, the flash is tucked in to its yliinit andsthe sheet passes between the rolls. The'angling' of therend 1O :ofzthe' knife senables-the flash "jfOld to he made andcompleted-withouttherflashtfold coniingiinjcontact *w-itlrthe end? of .the knife. The-tapered portion of ithie plate extends over the adjacent. ends of, the knurledsrollers above the bite of the same and the angled end of the knife terminates short of such ends of the rollers so that thefolded sheet with the flash portion thereof folded between Qrollers, of means located adjacent one end of the knife and arranged to engage a flash portion of sheet to folld and tuck iii-"the "flash portion "of the "sheet simultaneously with ..the -folding vof .theesame by th ec knife feldin unit."

2. lie-combination with a knife folding unit includinga pair of rollers and a cooperrating knife amovable' toward land; from the rollers, :of ;:stationary fforining plate arranged to support a'flash portion of a-sh'eet while uthe :knifek starts the fold beyondthe flash: portion, saidgplateioperating to tuckin the "flash iportion ,isimu'ltaneously with the folding :of "the csh'eetby :the. knife and E'the rollers. 1 f i The icombin'ation with; a Zknife folding unit including a pair of:rollers and a cooperating knife movable toward Land from the rollers, rii'zat-stationa'nyzplate arranged to sup- .tnand tuck in a.;flash portion ofazsheet, said plate. Jheingsset? at an 1 angle so that its terminal {portion will @be: elea'r of the flash portion of ithegfsh'eet zwhe'n the knife strikes the:sheet. c v

1, 3 ,4 9 .Iiri 1 r 4; The combinatiomwith aknife imitiincluding arpairof rollers and a cooperating drnife {movable toward and from the rollers, of ataberedforining plate arranged atrDIIeeend -JOfathe'knifeiadapted to support a flash portion :of a sheet aa'ndset at an angle to theilowersfaceiiofthe: same .to cause-its tipof the platezto iclearathe; said flash portion when theiknifesrstfikes.thesheet.- v

.:5. zThercoIiibination of a knife folding unit including? a :"pair :ofxzrollers and a folding knife :moviabletoward and afI'OIli the bite of the rollers "and having one f end cut away; to providea clearance space, and meansrlocated f-afdj acentfithe said fielearance space.- ;for;'. folding a flash portion of asheet'asimultaneously withthe folding of the :sheet rby' theiknife unitathe-saidsclearances'space permitting'the folding of the flash portion without contact with{theiendcofltherknife l I ,6. The combination of: a-knife foldingnnit ineluding' a epair of rollers land a (folding knife movable toward and fromithebite of thesrollersaand havingjonezend. cut away to provide a clearance spaceyand a tapered forming platesexftending to a point above the rollers and adapted to support a flash "portion nfithersheetiandfltuckiin the saniessi'mul taneously with the folding of the sheet by the said knife.

7. The combination with a knife folding unit including a pair of rollers and a knife movable toward and from the rollers, of a tapered forming plate adapted to support a tapered flash portion of a sheet and being of a width less than the tapered flash portion, said forming plate being located adjacent one end of the knife adapted to fold and tuck in the flash portion of the sheet simultaneously with the folding of the same by the knife folding unit.

In testimony whereof I affix my signature.

RICHARD P. MOGAARD. 

